Results 71 to 80 of about 1,642,785 (302)
Shiyou jixie, 2023 Measurement while drilling(MWD)is the best means to grasp downhole real-time drilling information and then conduct optimization control,and has been widely used in oil and gas well drilling.The mud pressure pulse transmission is the main method for MWD ...
Yi Ming +6 more
doaj
Measurement method of borehole wall resistivity for coal mine gas extraction
Gong-kuang zidonghua, 2022 For borehole wall state detection of horizontal directional kilometer drilling rig used for coal mine gas extraction, it is considered through analysis that the commonly used logging technologies such as gamma ray method and ultrasonic method are ...
LI Jie +5 more
doaj +1 more source
Review of Scientific InstrumentsThe continuous wave mud pulse transmission holds great promise for the future of downhole data communication. However, significant noise interference during the transmission process poses a formidable challenge for decoding.
Zhidan Yan +4 more
semanticscholar +1 more source
Deep Underground Science and Engineering, EarlyView.Triaxial compression tests under unloading confining pressure conditions were conducted to systematically analyze the permeability behavior of granite retrieved from the different classification surrounding rocks. Abstract The rock mass within mountain tunnels undergoes complex changes in permeability, strength, and deformation during tunneling ...
Xiaoyan Zhang +4 more
wiley +1 more source
Optimum Design of Rotor on Mud Pulse Generator
Shiyou jixie, 2017 The continuous wave mud pulse generator has a high transmission rate, and the generated pressure wave signal quality is mainly determined by the signal amplitude and spectral characteristics, which are closely related to the rotor shape.In order to ...
Huang Kai +4 more
doaj
Deep Underground Science and Engineering, EarlyView.An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang +5 more
wiley +1 more source
Multiphase technique improves mud-pulse velocity calculations [PDF]
, 2002 Measurement while drilling (MWD) has become a popular survey technology to monitor directional data, drilling data, formation evaluation data and safety data in the world. And closed loop drilling shows promise in recent years.
Shi ZH(石在虹), Liu XS(刘修善)
core
Deep Underground Science and Engineering, EarlyView.This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu +8 more
wiley +1 more source
Preliminary study of an intestinal bio-robot system based on nerve stimulation
Journal of NeuroEngineering and Rehabilitation, 2012 Background Wireless capsule endoscopes for diagnosis and treatment in the gastrointestinal tract face the common problem of active actuation. To tackle this difficulty, a non-invasive intestinal bio-robot system with active actuation based on nerve ...
Zhu Lan +4 more
doaj +1 more source
Making risk-informed decisions to optimize drilling operations using along string measurements with Wired drill pipe a high-speed, high-quality telemetry alternative to traditional mud pulse telemetry. [PDF]
, 2021 The ever-increasing demand for energy resources has led to drilling more complex and challenging wells. The information required to navigate through these complex geologies is provided by highly sophisticated sensors embedded in logging-while-drilling ...
Z. Ruysschaert, W. Gabriel
core